Sound absorption

When a sound wave strikes a body it is partially absorbed and partially reflected depending on the hardness and porosity of the material. The ratio between the occurring and absorbed sound energy is therefore the sound absorption coefficient, which usually lies between 0 (complete reflection) and 1 (complete absorption).
The sound absorption EA therefore indicates the process of reducing sound energy Eo in particular (but not necessarily) by conversion into heat. The distinction from dissipation ED is that this exclusively refers to the conversion into energy other than sound, in particular heat.

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